This fall I purchased 5 Oxalis adenophylla. I potted the firm, dark brown string covered tubers in a pot which was placed on the floor of my cool greenhouse (heated to 50° F.) Curiosity is this cat's besetting sin (but remember that while curiosity killed the cat, satisfaction brought her back.) So I did some poking around on Monday. Four are rotted and one has two white roots. Gently repotted into a smaller pot. So it cannot be winter low temperature that is the problem. regards, Judy in New Jersey where it is currently mild, gray, and drizzling.